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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc50a775c491d48b74eadaf009b8023f5c1f585edae2dd7aeaa71db9830a54c' 
  AND token = 'JBoNumdf0LiyWiVvYzOdCLT1A7BIH0sqzMU6tJsRFXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

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