SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa75cb53943df75749048055617bfc143479641133008a4ba796d61f0b2556b' 
  AND token = 'WiB+HMEnlxQ6LH9N4ey3SOjuOmjwejJAHYkMbSMFKv4=' 
  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