What bike and what what type of trails do you ride?
I don't think such thing exists, the manufacturers have no demand produce one, I'd say.
Lockouts are usually used by XC/AM riders, where an air shock can be an advantage for a lower weight bike and it's shorter travel performance doesn't suffer from it being air sprung.
Yet, what some coil shocks do have is platforms, like Pro-pedal from Fox's DHX line, which can stiffen the shock to some extent, to prevent pedal bobing while pedaling.
Also, shocks with low-speed compression external tuning can also somewhat mimic a platform or lockout while pedaling.