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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41cb7c67d9db0302ccccd3763f8919d0d934dce4732d7258eba5bca3b37f89b4' 
  AND token = 'nE4aQURZooH688t19xR2om0kHglV5JQvj50pXG/ML6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables