SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444a60e745b4fb7b29b1e4c2d4acfd1ed9a705b6532f6762bf83c6f7aa9b1794' 
  AND token = 'mponx25xoJ8EKXHGkTlgD0hDLjfnYRQMS+V+r5pEHoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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