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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b20eacc61ec74a0884bffb18b41088addfbca8f6e3294d9a2409221ed014978' 
  AND token = 'EB5aGEDzrY1sGSWwj84dLSZT69XDDsJ9DeTKuUUzbdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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