SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c69e9a0cb2c072a904ce48a93f815b85310a8e5008d5bbe3c6a153c8f9bd8bd' 
  AND token = 'BM7Rt9/WpWZ+7pkuWFicfGfAXyVF9uZzPTW3JnzfyqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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