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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6d0f213e88c7b3ad4484aebe6081a9b52a84b42362735d094a3113d1441250' 
  AND token = 'ly6xL3uzzrGQukk8o0jS15T6Lqmyytkid6jAA5iGkaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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