SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1330bac686ca15b705687102cc8b0022abf88d677e193709c626e645ff70e0' 
  AND token = 'XgDpksFVuJAOOCBYd5vGZC5DdJ/u0ZtUq5QLa/N3b/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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