SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922da3793a4e679653d3078622f827028edb56219b072e4c2cffbddd1f8c1185' 
  AND token = 'u6PQ7Lx0bgQFvBLHrK6Duzzoz8kcfJfr7wkZG0jcN+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}