Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ec4868545bdd43fa6ed4f1d102f31a2117d0ffe5411ee980a1c9339a8198d5' 
  AND token = 'Mma/gKjuM8cXEeLBkX8VAin+xTOcjI/DWpWVtcDEvVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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