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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2541cff36d699890ca0325ff7ff014ee564f78273453b9153a7d594f554efa33' 
  AND token = 'FFkFgi3eS/JFFw/LTc5LJcoKGDKj7NEfR75qCLePNxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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