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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6474a235ae0bd11d7945fc01e019665481693e1a559fb54cb1b791237cb335de' 
  AND token = 'GIt70NbWkkVoBWiaGAlc+uUTrIf/MCiIWaO1Vq4hLzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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