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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470497bba05bfa8a93f9da5d1f6cd037baf244228b5bbe02ec2dd05e26850ce9' 
  AND token = 'DyEIOW09YiBotxkwNQRQS1hcEh9nz4yBHBQBNZrecV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

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