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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c1a4210c6f2dd0e94a32b64f477de740d8e95677b16631184bfed2cc3e10bc' 
  AND token = 'tvAuzaMFfv6luz37euUrhNwITRJ3fi6duaEIsYm7Ico=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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