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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28bc16db62938022f6e1b94f7e510bad95d782e1e949b7848aa2783b70c29829' 
  AND token = 'gDRnP2azJjVudGynIHFylOz5c+5wWASnXCt7W4SfsxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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