SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cda6ff1290107a83614de32f566b069d85369d092f37536cdb60e6bce4e152d' 
  AND token = 'dyk3JUHF0bLqt9RiWC2qAQRzv4Yj//JmyVnT60/+7Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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