SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6877713a5dd31a8a8960b6b45e92ed40c8a4215ad697c3542d132346924f9c6d' 
  AND token = 'ryrhO/FraVviXqNZDauxrTDvd2Tf2fNIEUBnIxGS95Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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