SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11339aaf442c6c2c3c3bea7887ee68a22d3f4730fec5ec7d55ae215c686a93a4' 
  AND token = 'Wnw92XUFRKtJZtYB1kS1c6mjy1e0wEeEW+Xo/rNfX30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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