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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f92e47717d9607655632a407e32a413b553215c58d6ed0bfc5a1933f45a982' 
  AND token = 'wO/qvqqr3k1O8aMEegqzBLYtfBpSWhDUcHIz2fvhue8=' 
  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