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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9496ce0e789a76a76bdad44059a3cff104157593f4b23212632664fcc47f17af' 
  AND token = 'Wqu8oSybOkN0QKzAzI9heqqMFDq/X6esX0chzuNGwv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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