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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e76b26979ab0a9a1e013c074f557eee80a53b4739b469316528e00ad160aa3a' 
  AND token = '+30nJpGGwneCOKDvrXHqOQSaVgQMYalEe6bhdFNJkYk=' 
  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