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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2970fd51e463314174864c5a54ecd769a55b8563055737caee04f29ef794b89' 
  AND token = '/D4H8BBor7fbeQbIFbl2OdOfT0sUtzMB8GamemWnTKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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