SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dab8adc67afcd0016ae3fc98e3bbb5767c8f8815dc15b26e9385740b1074a59' 
  AND token = 'chEBx7au25QQbwHidjJontGKX7aJFKap3QT/jx6a3b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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