SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bea377e820862b2f8cf37ab99bd2f2711a9937d59bffce68be4ab041ba468d3' 
  AND token = '1GVP4kVRnRgpyt1bkIrYdVm/LCznOrvWIe/ozYrHIJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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