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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda13fcb461eee05ff091c618188d13f9cb5532107da53b685f6ed1f332c9507' 
  AND token = '3fl7GwJubxuKJAUK4WzMSCeWkUuw0hbFjVSf0hOGXzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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