There is no command (that I am aware of that speeds up the rockets themselves). If you want to do this, you will need to go into: \gameresources\generated\decls\projectile\projectile\player\rocket_launcher_lockon And change the "speed" parameter to whatever you want.
The Lock On mod is still there, but you don't "lock onto" enemies. Essentially treat it like Micro Missiles. Increasing the firing intervals slows down the firing speed.
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\gameresources\generated\decls\projectile\projectile\player\rocket_launcher_lockon
And change the "speed" parameter to whatever you want.