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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655b81f84366ce202e683d883567e7f6774bddc189ed616a8836be6e14e7213e' 
  AND token = '/MsWZ3sZWVZ194dcveQvR78BT2nJBReIE9/f+UqEQMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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