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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236de851695efce0c1b8ab82918c60476adb1b9681760e27fc7aa343d1b8fc81' 
  AND token = 'LnDPNW2WRR9uQH1W9vcKnKZbi1HvaH927+OqC7rtikM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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