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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084379e34b4b180c3fe1359778c5751c78976eea1e1ca036d26085351f4c847d' 
  AND token = 'KjVx4eHel0klog11FirxFw0gEkMGxi0sa4IxInHyw8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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