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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab160c63fdb884d170cff4891483a8ee14348123ec76fd58ed20e7582d16ca03' 
  AND token = '2ZqkGPQHUqiNPC9sMt8zk8dRje0c2C/iVn5DLsTpOUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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