I wouldn’t recommend lacquering or spraying it with something, since
this coating will eventually wear off in places, necessitating a
tiresome remove-and-re-do job.
Dip (never soak!) it in Tarn-X, rinse well, dry, rub with a
silver-polishing cloth. This only takes a few seconds. Sometimes,
just rubbing it with the cloth will do.
Try waxing it, and see how this works with the type of wear you give
To slow tarnishing, patina your piece in Jax Black, then rub off
most of the color with a slurry of pumice and water.