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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33e9cee631bf7fd17baddb398fa54e664ea598bdb33a6cb26b9340d2ad986ed' 
  AND token = '1duRSlLPkC4+dTBz1QRmkM7piFaqdslWZ3IiyKe6Xpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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