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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89893c9d63111e5cb80fc1ac7d6b7b2840e4745a6f8d957549cabee09c36ffee' 
  AND token = 'HCHV3nuQfq84sg/GCLbkl1hqL0M5mRWj5li6N25z008=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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