SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87da48d192bef0881ce0fe95af68ce553e6a383d6a1e408494c2c51afc254f7' 
  AND token = 'bt8sdoHzGhJwhGzMhTLj3UMl1uGZhvF6odBR82lZgwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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