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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f723cadb5f4f1097344ece0991ee6243c2c75b9669a74792a7b3649f77fdb6' 
  AND token = 'dri+4etT5aC9JT9JSFyo8DGmGVABJOTfwoVqw9H8evg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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