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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b0250a5676478183e4f75a5df7faa8665205d905e227bfcdc6fb27ae0ad239' 
  AND token = 'ZPuX5NDEVPeQIoVVOqDmz6y0APDeRhNk61YeBASZGQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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