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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484126abfe64c22632ed423ab52a23d0cb59f38214b86d8b9bd2d904de452c20' 
  AND token = 'FUUK/HjVkL6pkHu9J+Ag7/gOLvSx1dizN4OXpAHRi/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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