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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bac45f2d99df36923ef495968040af300a7cc2be72b91ded27baefe93a814ce' 
  AND token = 'KWzvEIX010L94d7qUdft1c/PHcRuRbrZiKohIddekH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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