No tax certificate issued for the sale of real estate for delinquent taxes to an individual for which no tax deed shall have been taken out shall be a lien on such real estate after the expiration of five years from the date of such sale: Provided, That whenever any extension of the time for redemption of said property is secured as provided in sections 79-2326 and 79-2401 of the General Statutes of 1935 the lien of the tax certificate shall be extended a like period of time.