There are no simple answers with regards to copyright because the courts holistically consider multiple factors. Proportionality is important so using a small portion of the work can lean toward fair use. Also the nature the work is important. If you use someone else's lyrics in your own song its more of a direct competitor to the original than if you use the lyrics in a completely different medium, like text in a comic. Despite what most people think, whether its for profit or not is the least important factor for fair use, but it can still sway the ruling one way or the other.
I'm no lawyer so I can't give you any definitive advice on this, but really I doubt anyone would sue over this usage of the lyrics. Unless you are rich and they expect a big payout from a lawsuit, they don't have much to gain by going after something that is not in any way harming their business. It costs money to pay lawyers for a lawsuit, so most companies don't immediately rush into that actually. In the very unlikely case the IP holder has a problem with the usage of the lyrics, they might send a message asking you to change them before escalating to a lawsuit, but I seriously doubt that would even happen.