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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dca0f273c5cc0103781137cf77e4f397e8585f62ab89d260c3b14c28ac6645' 
  AND token = 'KnwOMleaR8YQcd4m4xcxTJ9Z+THzUXF870AsVaZh7mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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