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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67b0200b0c4d42afc4291a39db0e2241b60542f807abe6a9fa72ac3394e7c22' 
  AND token = '3UOyk0qoXlmEFNskn7KAlWSzblaP8LaDTnLbKw4NF5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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