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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbddb10ff643bc1fd7491e1249229d8c018f94fb2cb371444ebf5234fd0597c7' 
  AND token = 'HPgc1mv5ie3MhxV5Qx4pkJjFUICw33PvapbXeRAdCQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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