SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a096ec7ee45025230dc9c703d02b585fae1df768ba3b39329bd8080b976f5814' 
  AND token = 'NIom/O0ybc9bn6Dlo7YlQ8XPZYrU+SXcXsCAWCyXsTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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