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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba3f8c67103578fa1266bc67a878b18f3f926f1ce3bcb795535bbd54d485f3e' 
  AND token = 'ygqGwSWeCyDBpWXwotn0XYAIyWV6YZIwXvp6vr4yXlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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