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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3510cf52e2d83ecefa0b83f475f7c365a4c1bb9f3c8a00458d8fb3807ecee60' 
  AND token = 'ADPyD7sLpnj0JkTakDFz5obMxgv9C94qQ4AvKuB2efA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

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