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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330bd60fe28d7021c658cc26f6834d7b4e04e048232954fa3d6e31cc74dccb63' 
  AND token = 'xzZ/Iru8SGBp+5S8WYmPY+ABLqYRe5rXvE4CcSMhyXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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