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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df00d3853b0cc81ffff09828ce1760e63f7feb37744cda6160d6887242fb1d2' 
  AND token = 'OLIDjFeMBJhWEuw/At73if5j2KPkIyuoMu4MDHnP4ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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