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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac528a3613430a62079f6801ca172226b79da7e90227eef93d351ca70931683' 
  AND token = 'dbtIbinN26W2liMm1ZCOhAKUT0SHxbJ2cxlgx8qTjlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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