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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d126d47a641b39f9675ba851eb35d63565a011241fcb6df1b5469240db0617a' 
  AND token = 'KjqCkou5Q9ND0V2KLDJNp5gjfgIPLl6wiPTSe6H05XY=' 
  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