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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b19ae9fc5daf48aac80fb67d6bd19a2e0f6dd3a1680eb69e69afa74640589e' 
  AND token = 'cBbNRYUKdaInQVz7KSYZuFgkvH1CLVEJlL7ZPDK7pII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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