SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2159db86fa4b9143021f2d28d31d4df6899d5761c2bbc9f9b3af75b2a952f4' 
  AND token = '1doFw0zuttZLe1XzAZ35q0h/c25TIVKA6zntJNSn3eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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