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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a49df65e25aa57372b8f0c28fc2abc94a0e6deb610fa278e4478eb17511f151e' 
  AND token = '0Qti/+kkfhPPqQMtk/Qa3lywzzxTalDOGgqBUknRPYc=' 
  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