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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268235297e59d14d001488a0ad088b07e84f50f1ad4dfcab8b238f284012d46d' 
  AND token = 'V70QMfiR/o41T38rVrpz8YZjtucHZwkmgt5Tpl+5+9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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