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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475e58c6e4403b16925cfdb49318de811e75d6ca2c2e0aa216ca2f5e63feab90' 
  AND token = 'YSbsrPKbc8Ra4QufOqtcANKvDU2IGbUJDlXnjupjMEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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