SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2caf853a09805f3ea0e75ff0a8f99dceb0bb0df2493a15401df477b82df9eb6b' 
  AND token = 'cEdtLj1XdVg/df6gDfV1fZNkziwy3U96G5FKAi5tEps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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