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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd298d8d9ec7fd209cc915bc5803235a8d27889b7175667498b36429f7523a947' 
  AND token = 'bTxdfAJTAyElYfwQMA/GNGBlkEXH6HQ8foMWq8JJZ7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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