SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9144eceadcf49c2e90cb023411dd1815294a6a14947cce36fb5b6ac5d45e6d' 
  AND token = 'X6Dk0cgAP8Fl/y8Plnsx3Ru/7qHVi3YMhIvaE52OdZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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