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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '448d4990e92c17f4475fda724bb6ff8d55c1de8a343c65fab24ff761d0934fdd' 
  AND token = 'fO1unNO4yK/18w2WNP6AmtDix22yiDKYNDquHrnrpTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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