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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362a671bb9a705f6ceafb098c92f7c0352d1bbea3c7abf399660ecce8c112f3a' 
  AND token = 'BdyDsjijoDq86HD8TxJUDhLyfEEbKwps0Rtqiv0RDB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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