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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10eeab5513178f4d3e0fec5e3fa07fe32af279106a574e9aefb73f2f313f2b50' 
  AND token = 'KVH0Cn1TcKfrxMHjPUuCKcmgB43hxFpXFVyxQwtNvks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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