SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66e0efd87285e93b4e76eb211b564075b6d2b87c97863f97562596c785dfefac' 
  AND token = 'RsL1UIjZaWTYhbNVnM/wXmZwNmRkzqHE1Vx4p+LP3GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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