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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e573937ce7382fe26f68c76a42db71f1e0d1da18f3589467e9815316b8d819' 
  AND token = 'Wl6fKKvKbcdclsNph9JBRV2NsSiB99DS52lxSZ+e2bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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