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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63864ac749a882a87f16059fe0ab209c862a298ae753178b64661574af3477fc' 
  AND token = 'HPc4776e7zL9oRUJqkNzdtAMkywplSiotL8UTPnE6fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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