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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26ed6498eb02ac79202536afa60b17b03eced735e358b538248088a526f8f97' 
  AND token = 'YHvouYgzFtFGETTXF5xWuPVdfPI8ZvMoQ1xgX/fEP9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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