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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb1b16d4fff61b536b21708364bfb39c3c8f047c96aab3dfad9a1d7dfa4985c' 
  AND token = 'bFecMrvPHJZB0sg354IS3jbTi04wUN/qTX56opdSdxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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