SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9924e5bb71760e5d2ba927b041fd1bfe5748a955f2319a11c5ad798c905f677b' 
  AND token = 'QYw/gYLIi3Kg6kwHB/hmMyTejNZoh9Ky0LP6onI0PcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

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