SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a7d5c9279e3e400be1cdc6a87431c42cb9a01127af6a7effb83a41351ad7b8' 
  AND token = 'YBSr2JAOZpME1xKM03nBHD0Irl9GtORy9R/95YL/lPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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