SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01b40db21387d2d754e2712aaf4456272ac2089e60a7e70361b8dc1042b8f492' 
  AND token = 'YO9GiSa+YfttfFHPsmXrgcInoq8kidUbayovDtp+cgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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