Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f83f21f60ae8049e3e35bb21baba05729a3eee21bc1f29395a67e8a65b55745' 
  AND token = 'aOFbBi62qcxvqSQbNbj9QWxbXRPBtYGFQ6WiF4JXlgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}