SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d5cc7304360d3b05b725981457450b5ff42b8b8fefef577b74d8adf1f38941' 
  AND token = 'HgyYz5/bmSgYBxj8tFL1UrtIPPw6Mj7bckZ7bKkWUZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

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