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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c34bba5150f1008d8f81e1d7b45cbf9c9c301fa95c5cfb29470fa4f72878338' 
  AND token = '5w0cw/nBPhOHSKtU/wfhdRmkXK+C5blMld5e7n3Jo6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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