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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd146697c9b703d15174570d8a0fd6b4f661972ea469add0d8276a8ae5b7d81e7' 
  AND token = 'pprZ9Vsf8tRmtzDG9klDG7zZzIC0232ithC9VscvsoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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