SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d8c86d32d84727e0a4059e31d93f9f017619bb243b4f2615eb22060c0266bb' 
  AND token = 'csy5bWZTiGOl5rXUhkA/kBqEexPPT+CzZK4vwVZKrSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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