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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e265a62b3e39516603e3568e0f4b506eeb5b8422b757f19324062bdcc40ed7' 
  AND token = 'v2Kzt3FMuuMhEaQVhew7193F4oOA35dsPkqvFAzjFf4=' 
  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