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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f8baf67129f6584e7b31be26d731629006dbc2bba5a308187e6d8b91c1fd77' 
  AND token = 'ydLtmqjNGo8dah7HELSSVWpJomP++wkJ13GnkbBXX/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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