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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019483429f37b34a1d04684f85abe3308daead8e8a4335b3e1a48ceda5e7ab7b' 
  AND token = 'oiKzVaCdZWMHmPTtkHdnupvtGtx1pkka8C1Ad+muA0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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