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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f3be836393cbc3e57a6b6e8f82fe8e57196416dd5a6b56a80412f14a7a7d35' 
  AND token = '9Qo96KxW48kJlfCecKzcrVDfRLIy5P520VEPh4GwS6o=' 
  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