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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5ccaefda5ab90a33b87a55ef45873ebb4eda77393be996895794e72c00b313' 
  AND token = 'zMwbvkSOOe5fWjtYrAUJcXP3zXcKTHbe1wH0C8ie5G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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