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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b815393fd7808c8684885b3bb8a9433f533d43ca06a6c1f67a6d803dd83e56e5' 
  AND token = 'DI51jBmMu+Y13MWrEEGG6HiDznpfn+KzUN5dfkLkeeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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