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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a67610a43ebe79599897604db5e90b22b19e3466aac718e828e560b24400d7' 
  AND token = 'RWDHQZI3v1m341nwB9HiEvf6pO9N5fGhgg8V5PpBmGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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