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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285eb94643d482e702860a7db456c9746b9e061262e3d90492a4fa94bec08034' 
  AND token = 'qwRDwmx9CyKAOjyRztJfcblENy8PnuvU/Krl0EW2tVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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