SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f022aded4f674f4022a24080b3def6663f71c5b342fa199b7365f180c197db0' 
  AND token = 'zFzV4vtCUbhD9gSVsUQMVCXl9uqi/vCqPO/qhknMxas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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