SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899f63631887206fb98552a40a2d497792d93812ac72057e35e356cfea452dad' 
  AND token = 'zw5eWM+q/T15Ak6LQP5QVzu6chvkhoA5/1njjOvvU5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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