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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0af32a57bebad6a4d133b727b40e68b03a1c4b9c894ebd1a0dead84a79eb71' 
  AND token = '2pCIcKdQd0aNIlkIaJHdMx7hT9ehCjfAzkDK4fQDr20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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