SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34975b9ef47e64d0fd2921e6ac24fe9a258623ab51f4eed3d20bbb37f70a12f3' 
  AND token = 'lUc2DFn/LyLb58I4yYLfYNCVi8OB+Pnu/wDBuZMnxa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables