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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e589950b07b15d6b9c3c7d9d9871f9e66c651d89818dfad6dee0ce4c535f60c7' 
  AND token = 'Se7NoV/AFp/UYuIoQpXvMKD/5QomZEtZbPyTQxkN4mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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