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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aed01de20fae9c7701c120f7730004834628b340b74c0eabb8c4f235b4ee2c4' 
  AND token = 'v3ppoemS8R81u2qHIVEFFZVcJwOCCtZMgSSYgw5RtRQ=' 
  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