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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970a9faa2a3dd18931fde2326fe0250a50d1df7b7ce39c5831978092745f625a' 
  AND token = 'TB5CnMB0f+S//XBeWA3ubdaNe/NzHOnGEtAosA2YeC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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