You won't be able to reach that room for quite a while.
In fact, it won't happen until after you find and relight the burial chamber --
So how do I actually find the burial chamber?
How can I light the burial chamber now?
-- and solve both the scarab puzzle --
How do I solve the scarab puzzle?
-- and the disk puzzle.
How do I solve this panel with the disks?
Once you've done all that, climb the scaffolding and turn around, then you can just jump across the pillars a la Lara Croft.
What is there to find in the upper room?