SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1627314a3c98434e665529fc7cd0f160e6e77eb9a04bb27248fdf9c00176efc5' 
  AND token = 'jjc8novbq93Wh/QT+SYB/C4ar8zAguRwOowB8xX+oxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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