SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725cb1856dafa0564a7e31b37f4c5c29b8377a5e919be94b147c6f6ab9d08f2f' 
  AND token = 'z576a7uXqTTdYTi4IhbbW582POb/Lcu+s3oRdUG1Z6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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