Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff6ae239679518f7da195822316b1f647e5146a42307ddfe8b0a4a81888f465' 
  AND token = 'TpOTw1B/bd2nY5Axm+yZrsydsOWTLkZdWB4+bmqIhWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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