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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae90ca27364e56789020429e2613321a3b28963c22d06f002adcf17cf4fb1a90' 
  AND token = 'HPuIUwoKx1x/6J635mVdyfIt+VBWXBhas+UeWIw+mOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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