The weight of one ashrafi is 4 gram and 374 milligram gold or its price. At the time of paying the mahr gold equal to it or its price in place of ashrafi should be given. As far as the matter of rupees is concerned since it has turned into a value, so only 45 thousand shall be wajib on you. However with mutual consent excess in mahr is also lawful; hence if you want to give amount more than 45 thousand then it shall be lawful as per the Shariah.
وان زاد فى مهرها بعد العقد لزمت (ملتقى الابحر)
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband