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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306d9161480473ee2b974711a974ad49fe2ef28d799bc38f2774402dee279ec6' 
  AND token = 'CibtAHSC8/WdJ8otL54rMhn92bVC29hWQG8sPIXFLKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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