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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d218b2035002f8b4e0f3a0f095ed4f6ecb40c06bc9a5b7c944c664c11d8ba1' 
  AND token = 'mSgkIzdutuoXyLSI1Afn6v5j7sGZXODLZLpeTiO5hi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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