Can you prevent the lockout screen from occurring during display sleep when streaming to chromecast?

On my MBP, if I’m streaming something to the chromecast for any appreciable length of time the display sleeps. That’s not a bad thing, it’s supposed to do that, but the trouble is, if I want to pause playback, it’s not a matter of simply hitting the pause key to immediately pause. This is because pressing any key wakes...