SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c30d8a3b0d147000e5a853d9323bc04bb5c0114fcdb5bdf33942746abfb76d' 
  AND token = 'N3i9PyArIrT5uUhg0EPFBqjYAeixPNME9/nEwznAUy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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