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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7809a8322d6b9f6af095fa98a92ff385bf1b1ad0004ea48955b6d6cab99b262c' 
  AND token = 'QgUj769S6ETNId1qI6qNPST6iG3CQXlxFaBqFB7MQ8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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