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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019c4a6719130cef6fb11749a5412d174053abc74a4c36f2700e34b942bc2be1' 
  AND token = 'yfVekVigHntCKfElPhQJgCn66XV8awlZ9wlgBkCWqCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

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