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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafcf41ba2d7b3a30af6d2b08e8cef0095d3bf28784b249d66323d9f04cd7bb1' 
  AND token = 'YPVUzNkp4xgBWPnqiDdicu5l9CmbXGanL3tFIZOXmQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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