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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03651d3456cae15a083d5c4f7d7d4ee5258942a687efd7e3029547807b165b6b' 
  AND token = '4a8ALDlduoAve5nlvo4w486y8oCM4iZwL6e4f1YI/3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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