SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfebd5220236f196564b1f19b69854a8150cc5cf6a7e753c0e0fb5b199168dc9' 
  AND token = 'eWiKCIN0pe2/6WuPfDVvMJl9qBHUnQWpVTYVX+SY+qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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