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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43f357760859dd4d08b5eaf7af8f626719f601c88b440997e26258c9c9d2762' 
  AND token = 'UNCGSGyZ9M87vuFgua5TX3OnW3aL0V3tyPRnYEeXiT0=' 
  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