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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45de19ebdf2ebb031cfd5694a1bfcbc3efdb737704cd7812d4a53c187a247cde' 
  AND token = 'ND2C7FwWyZWvyVaRIrvtu6lx9J5xuzbF9oAa1IiDBS4=' 
  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