SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9643b5ca7d056eb0249aa70881df2eaabe211c9062bc591d570ed6ab20d2fa7' 
  AND token = 'HfL1uqFytkOAWVDQSvv5Q3oHgOCJamC9bZd9V+x1YTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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