SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0fdb5b40b91d226af2a1a4c636a68afb84a199ea5efb04545301bdac08da8c6' 
  AND token = 'otNYR0CrXl692a87+9BFXWLP6Q+xDYjgphtUjMljgIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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