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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231db7b476eb085ebde34633e71f28e867c3efb4c6368cda97bbd23bcb554caf' 
  AND token = 'rMkLifqW2TIwaUrkm6FxrZZ97280wmSikl1OFWV8Ko4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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