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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c0a78821b594635986b6299956e293d882e15d98dd93b049b1066c9d873c2f' 
  AND token = 'WXHgX93gJAp57Bq7AyPxgOOG5NNHaWvA3H6pwsbjKD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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